With regards to the 2387 issue, they certainly have the option of choosing to drag their heels to get to this development - I mean, the jump from 2381 to 2386 happened almost in real time, while previous 'years' in the books have gone on for several out of universe years. It's been borderline breakneck, particularly when you factor in that you can generally expect that only around six books out of each year takes place in the 24th century time frame, given the TOS, Enterprise, and Seekers lines also running and putting out new books over the last few years. There are some gaps to be filled - Fallen Gods, the Titan novel, ended on a cliffhanger, probably meant to be returned to in the next book in the series, but instead the next Titan-esque novel, The Poisoned Chalice, took place an in-universe two years later, and the events in The Fall resolved the overarching reason for that cliffhanger without directly addressing it.
If anything, I'd prefer it if they took at least a few years to go slow, maybe even tell some stories set further back in the timeline in that intermediate time, allow TNG and DS9 to really stabilize themselves and let the audience get to know the various cast members who have been introduced without getting much of a solid identity. TNG and DS9 have been heavily event focused, plot oriented, as opposed to being character driven, and it has been a bit of a drag on the novels. If anything, taking their time and avoiding barrelling forward into 2387 could easily be an advantage.
If anything, I'd prefer it if they took at least a few years to go slow, maybe even tell some stories set further back in the timeline in that intermediate time, allow TNG and DS9 to really stabilize themselves and let the audience get to know the various cast members who have been introduced without getting much of a solid identity. TNG and DS9 have been heavily event focused, plot oriented, as opposed to being character driven, and it has been a bit of a drag on the novels. If anything, taking their time and avoiding barrelling forward into 2387 could easily be an advantage.